Sub Camera for K5 owners

I recently posted that my K5 has failed me while traveling in Japan on business. I do not own a sub camera (I know this sounds quite silly, perhaps for those who own many cameras) and this situation here me traveling without a camera is forcing me to stop at a camera places....

I looked at Q sometime ago, Fuji X100 etc,,right now my time to do the research is quite limited but I thought I would start with learning what many of you who own K5 or 7 carry as a sub camera. I often need to take many photos indoors, under low light rather than outside scenes.,,,